CN114213043A - High belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker and preparation method thereof - Google Patents
High belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker and preparation method thereof Download PDFInfo
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- 239000011575 calcium Substances 0.000 title claims abstract description 84
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 84
- 239000004568 cement Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 41
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 25
- 235000019738 Limestone Nutrition 0.000 claims abstract description 18
- 239000006028 limestone Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 238000001354 calcination Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 10
- 235000012241 calcium silicate Nutrition 0.000 claims description 9
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 239000010440 gypsum Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010304 firing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 238000000265 homogenisation Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000036571 hydration Effects 0.000 abstract description 19
- 238000006703 hydration reaction Methods 0.000 abstract description 19
- 229910001570 bauxite Inorganic materials 0.000 abstract description 18
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 abstract description 13
- 239000000047 product Substances 0.000 abstract description 9
- 239000011707 mineral Substances 0.000 abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 239000006227 byproduct Substances 0.000 abstract description 2
- 238000002441 X-ray diffraction Methods 0.000 description 11
- 239000011812 mixed powder Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical group [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000003991 Rietveld refinement Methods 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001844 ye'elimite Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/345—Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high belite-calcium sulphoaluminate-calcium sulphosilicate cement clinker and a preparation method thereof, which is prepared by mixing 56.5-64 parts of limestone, 5.8-12.5 parts of phosphogypsum, 19.4-30.2 parts of fly ash and 0-11.7 parts of bauxite, calcining for 30-120 minutes at 1150-1200 ℃, taking out a calcined product, rapidly cooling to room temperature and then grinding. The invention uses the industrial byproducts of fly ash, phosphogypsum and the like, as well as limestone and a small amount of bauxite as raw materials, the calcination temperature of the clinker is about 250 ℃ lower than OPC, about 100 ℃ lower than CSA cement clinker and 150 ℃ lower than CSA cement clinker, and the energy consumption can be reduced; the clinker has low calcium content, uses less limestone raw material and CO2The discharge is low, the clinker has low dependence on high-quality bauxite, and low-grade bauxite can be used in a small amount even without adding bauxiteAn aluminum source; clinker contains sulphoaluminate minerals, so that the early hydration speed is high, and the early strength is high; the clinker has good grindability, and can obviously reduce the energy and mechanical loss required by crushing the clinker. In the late stage of hydration, the strength can still continue to develop.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker prepared from industrial waste raw materials and a method thereof.
Background
The main mineral in ordinary portland cement clinker is tricalcium silicate (C)3S, alite) with a high formation temperature (1350-2The emission is large, and great environmental pressure and energy consumption are caused. Many organizations around the world are actively exploring new clinker systems, such as the sulphoaluminate cement clinker (CSA cement clinker) developed by the Chinese institute of building materials science, the main mineral being calcium sulphoaluminate (C)4A3Ye' elimite) and dicalcium silicate (C)2S, belite) is prepared by calcining limestone, alumina and gypsum which are used as raw materials at 1300-; aether cement clinker proposed by Lafarge, france, the main mineral being C4A3$、C2S、C2(A, F) can be produced at 1200-1300 ℃; heidelbergegment in Germany proposes a belite-calcium sulphoaluminate-calcium sulphosilicate system cement clinker (BCT cement clinker) with C as the main mineral4A3$、C2S、C2(A, F) and calcium sulfosilicate (C)5S2And tert), can be produced at 1250-. Because of the low calcining temperature and CO of the clinker of the systems2The emission is less, and the cement prepared by the method has the advantages of quick early hydration, high early strength and the like, and is concerned by scientific and technological workers in the field of domestic and foreign cement in recent decades. However, at present, C is aimed at home and abroad4A3The raw materials adopted in the preparation of the clinker system mainly containing minerals have high quality, for example, bauxite is used as a raw material in a large amount, so that the clinker of the system has high cost, and the clinker system also does not accord with the policy of environmental protection policy in China. Therefore, the invention provides a method for preparing high belite-calcium sulfoaluminate-calcium sulfosilicate system clinker by adopting industrial waste raw materials.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art and provides a method for preparing high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker with good strength development by using industrial waste raw materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high belite-calcium sulphoaluminate-calcium sulphosilicate cement clinker is prepared by firing a raw material prepared from the following raw materials:
preferably, the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker is prepared by preparing raw materials into a raw material and then firing the raw material:
specifically, in the raw materials, the CaO content in the limestone is 45-56 wt%; SO in phosphogypsum3The content is 35-47 wt%; SiO in fly ash250-60 wt% of Al2O3The content is 30-35 wt%; al in bauxite2O3The content is 75-85 wt%.
Preferably, the chemical composition of the feedstock is as follows:
specifically, in the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker, the belite content is not less than 40 wt.%, the calcium sulfoaluminate content is 20-35 wt.%, and the calcium sulfosilicate content is 2-23%.
Preferably, in the clinker, the content of belite is not less than 48.5 wt.%, the content of calcium sulfoaluminate is 30-35 wt.%, and the content of calcium sulfosilicate is 10-15%.
Further, the invention also provides a preparation method of the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker, which comprises the following steps:
(1) respectively drying the raw materials and then grinding to obtain raw material powder for later use;
(2) mixing the raw material powder in the step (1) according to the parts ratio, and homogenizing by a mixer to obtain a raw material;
(3) calcining the raw material in the step (2) at 1150-1200 ℃ for 30-120 minutes;
(4) and (4) taking out the calcined product in the step (3), rapidly cooling to room temperature, and then grinding to obtain the catalyst.
Specifically, in the step (1), the raw materials are ground into powder with the particle size of less than or equal to 200 meshes.
Preferably, in the step (2), the homogenizing time of the mixer is 12-24 h.
Preferably, in the step (3), the raw material is heated to 1150-1200 ℃ at a heating rate of 10-20 ℃/min.
Preferably, in the step (4), the rapid cooling is implemented by air cooling.
The invention also claims a high belite-calcium sulphoaluminate-calcium sulphosilicate cement which is prepared by mixing the clinker and gypsum, wherein the mixing amount of the gypsum is determined by the calcium sulphoaluminate and SO in the clinker3The molar ratio was calculated as 2: 1.
Has the advantages that:
the invention uses the industrial byproducts of fly ash, phosphogypsum and the like, as well as limestone and a small amount of bauxite as raw materials, and the raw materials are calcined at the temperature of 1100-1200 ℃ for 30-120min to obtain the cement clinker, wherein the calcination temperature of the clinker is about 250 ℃ lower than OPC and about 100-150 ℃ lower than CSA cement clinker, and the energy consumption can be reduced; the clinker has low calcium content, uses less limestone raw material and CO2The discharge is low. The clinker has low dependence on high-quality bauxite, and low-grade bauxite can be used in a small amount even without adding bauxiteAn aluminum source; the clinker has good wear resistance, and can obviously reduce the energy and mechanical loss required by crushing the clinker. The cement prepared by the clinker of the system has the advantages of high early strength, continuous development of later strength and the like.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
FIG. 1 is an XRD spectrum of cement clinker and CSA cement clinker prepared in examples 1-5 of the present invention.
FIG. 2 is a graph of net paste strength at different ages for BYT and CSA cements prepared in examples 1-5 of the present invention.
Figure 3 is an XRD pattern of CSA cement hydration at different ages.
Figure 4 is an XRD pattern of BYT cement prepared in example 1 at different ages of hydration.
Figure 5 is an XRD pattern of BYT cement prepared in example 2 hydrated for different ages.
Figure 6 is an XRD pattern of BYT cement prepared in example 3 hydrated for different ages.
Figure 7 is an XRD pattern of BYT cement prepared in example 4 hydrated for different ages.
FIG. 8 is an XRD pattern of BYT cement prepared in example 5 at different ages of hydration.
In the figure, E is ettringite; g is gypsum; b ═ dicalcium silicate; t ═ calcium sulfosilicate; y ═ calcium sulphoaluminate.
Detailed Description
The invention will be better understood from the following examples.
In the following examples, the chemical composition of the starting materials is shown in table 1.
Table 1 chemical composition of raw materials (wt.%)
Example 1:
the raw material composition of the high belite-calcium sulfoaluminate-calcium sulfosilicate clinker of the embodiment is as follows:
the preparation method comprises the following steps: drying the fly ash, the phosphogypsum, the limestone and the bauxite for 24 hours at 100 ℃, and then grinding into powder with the granularity of less than or equal to 200 meshes; mixing limestone, phosphogypsum, fly ash and bauxite according to the proportion, mixing in a mixer for 12h, pressing 20g of mixed powder into a wafer with the diameter of 20mm under 20MPa, putting the wafer into a box-type resistance furnace, heating to 1150 ℃ at the speed of 10 ℃/min, preserving heat for 30min, taking out, and rapidly cooling by wind power; and crushing the clinker blocks to 200 meshes to obtain the finished product.
Example 2:
the raw material composition of the high belite-calcium sulfoaluminate-calcium sulfosilicate clinker of the embodiment is as follows:
the preparation method comprises the following steps: drying the fly ash, the phosphogypsum, the limestone and the bauxite for 24 hours at 100 ℃, and then grinding into powder with the granularity of less than or equal to 200 meshes; mixing limestone, phosphogypsum, fly ash and bauxite according to the proportion of 58.00/10.33/20.61/11.06, mixing in a mixer for 12h, pressing 20g of mixed powder into a wafer with the diameter of 20mm under 20Mpa, putting the wafer into a box-type resistance furnace, heating to 1150 ℃ at the speed of 10 ℃/min, preserving the temperature for 30min, taking out, and rapidly cooling by wind power; and crushing the clinker blocks to 200 meshes to obtain the finished product.
Example 3:
the raw material composition of the high belite-calcium sulfoaluminate-calcium sulfosilicate clinker of the embodiment is as follows:
the preparation method comprises the following steps: drying the fly ash, the phosphogypsum, the limestone and the bauxite for 24 hours at 100 ℃, and then grinding into powder with the granularity of less than or equal to 200 meshes; mixing limestone, phosphogypsum, fly ash and bauxite according to the proportion of 60.10/10.02/25.55/4.33, mixing in a mixer for 12h, pressing 20g of the mixed powder into a wafer with the diameter of 20mm under 20Mpa, putting the wafer into a box-type resistance furnace, heating to 1170 ℃ at the speed of 10 ℃/min, preserving the temperature for 90min, taking out, and rapidly cooling by wind power; and crushing the clinker blocks to 200 meshes to obtain the finished product.
Example 4:
the raw material composition of the high belite-calcium sulfoaluminate-calcium sulfosilicate clinker of the embodiment is as follows:
the preparation method comprises the following steps: drying the fly ash, the phosphogypsum, the limestone and the bauxite for 24 hours at 100 ℃, and then grinding into powder with the granularity of less than or equal to 200 meshes; mixing limestone, phosphogypsum, fly ash and bauxite according to the proportion of 64.00/5.80/30.20/0.00, mixing in a mixer for 12h, pressing 20g of mixed powder into a wafer with the diameter of 20mm under 20Mpa, putting the wafer into a box-type resistance furnace, heating to 1170 ℃ at the speed of 10 ℃/min, preserving the temperature for 90min, taking out, and rapidly cooling by wind power; and crushing the clinker blocks to 200 meshes to obtain the finished product.
Example 5:
the raw material composition of the high belite-calcium sulfoaluminate-calcium sulfosilicate clinker of the embodiment is as follows:
the preparation method comprises the following steps: drying the fly ash, the phosphogypsum, the limestone and the bauxite for 24 hours at 100 ℃, and then grinding into powder with the granularity of less than or equal to 200 meshes; mixing limestone, phosphogypsum, fly ash and bauxite according to the proportion of 56.50/12.43/19.44/11.63, mixing for 12h in a mixer, pressing 20g of the mixed powder into a wafer with the diameter of 20mm under 20Mpa, putting the wafer into a box-type resistance furnace, heating to 1150 ℃ at the speed of 10 ℃/min, preserving the temperature for 90min, taking out, and rapidly cooling by wind power; and crushing the clinker blocks to 200 meshes to obtain the finished product.
XRD tests are carried out on the cement clinker and the CSA cement clinker after the calcination of the examples 1-5, the scanning speed is 5 degrees/min, the step length is 0.01, and the results are shown in a figure 1. As can be seen from the figure: no diffraction peak of free calcium oxide is seen in BYT clinker, which indicates that the clinker is easy to be sintered and has a small amount of aluminate intermediate phase (C)3A，C12A7) And residual calcium sulfate that is not completely reacted, which is a result of incomplete formation of calcium sulfoaluminate at lower calcination temperatures.
According to XRD pattern, Rietveld refinement and NIST Al are adopted2O3The mineral composition of the clinker was calculated quantitatively as an external standard and the results are shown in table 2. The content of belite in the clinker is highest, and then calcium sulphoaluminate and calcium sulphosilicate are used, and the total content of the three main phases is more than 95 wt.%.
TABLE 2 mineral composition of clinker
The cement clinker obtained in examples 1 to 5 was mixed with gypsum in the amounts of 14.61 wt.%, 21.95 wt.%, 15.35 wt.%, 12.47 wt.% and 21.33 wt.% based on the mass of the clinker, respectively, to obtain gaebert-calcium sulfoaluminate-calcium sulfosilicate cement (BYT), and 32.67 wt.% of gypsum was added to the clinker of the sulfoaluminate Cement (CSA). The compressive strength of the cement paste cementing material is measured according to the general cement paste strength test standard, the water cement ratio is 0.6, and the result is shown in figure 2. As can be seen from the figure: the strength of the CSA cement is not basically increased in the late stage of hydration (90-180d), the BYT cement still has better strength development, the strength can be continuously increased in the late stage of hydration, the strength of example 2 in each hydration stage is higher than that of the CSA cement, and the late-stage strength of examples 3 and 5 is gradually higher than that of the CSA cement.
The obtained high belite-calcium sulphoaluminate-calcium silicate cement is subjected to hydration experiment by adopting a water-cement ratio of 0.6, and is cured in a cement constant-temperature curing box with the temperature of 20 +/-0.1 ℃ and the humidity of more than 95 percent to respectively obtain hydration samples for 1h to 90d, and XRD (X-ray diffraction) spectrums of hydration products of the samples are shown in figures 3 to 8. As can be seen from the figure: the hydration products of the BYT cement are mainly ettringite; the hydration speed of calcium sulphoaluminate in BYT cement is very fast, the calcium sulphoaluminate is basically completely consumed after 6 hours of hydration, and simultaneously, the calcium sulphoaluminate in CSA cement is basically completely hydrated after 1 day along with the fast consumption of gypsum. The diffraction peaks of calcium sulfosilicate decreased with increasing hydration time, indicating that calcium sulfosilicate, which has been considered inert, develops hydration activity under the influence of calcium sulfoaluminate hydration. The diffraction peak variation of belite is not very pronounced, which is related to its slower hydration rate.
The present invention provides a high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker and a method for preparing the same, and a method and a way for realizing the technical scheme are numerous, the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and modifications can be made without departing from the principle of the present invention, and the improvements and modifications should be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker is characterized in that the cement clinker is prepared by firing raw materials which are as follows:
2. the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as claimed in claim 1, which is prepared by firing after formulating a raw material comprising:
3. the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as claimed in claim 1 or 2, characterized in that in the raw material, the CaO content in limestone is 45-56 wt%; SO in phosphogypsum3The content is 35-47 wt%; SiO in fly ash250-60 wt% of Al2O3The content is 30-35 wt%; al in bauxite2O3The content is 75-85 wt%.
4. The high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as claimed in claim 3, characterized in that the chemical composition of the raw materials is as follows:
5. the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker of claim 1, wherein the clinker has a belite content of not less than 40 wt.%, a calcium sulfoaluminate content of 20 to 35 wt.%, and a calcium sulfosilicate content of 2 to 23%.
6. The high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as claimed in claim 5, wherein the clinker has a belite content of not less than 48.5 wt.%, a calcium sulfoaluminate content of 30 to 35 wt.%, and a calcium sulfosilicate content of 10 to 15%.
7. The method of making a high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as claimed in claim 1, characterized in that it comprises the steps of:
(1) respectively drying the raw materials and then grinding to obtain raw material powder for later use;
(2) mixing the raw material powder in the step (1) according to the parts ratio, and homogenizing by a mixer to obtain a raw material;
(3) calcining the raw material in the step (2) at 1150-1200 ℃ for 30-120 minutes;
(4) and (4) taking out the calcined product in the step (3), rapidly cooling to room temperature, and then grinding to obtain the catalyst.
8. The method for preparing the high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as recited in claim 7, wherein in the step (1), each raw material is ground into powder of 200 mesh or less; in the step (2), the homogenization time of the mixer is 12-24 h.
9. The method for preparing high belite-calcium sulfoaluminate-calcium sulfosilicate cement clinker as recited in claim 7, wherein in the step (3), the raw material is heated to 1150-1200 ℃ at a heating rate of 10-20 ℃/min; in the step (4), the rapid cooling adopts an air cooling mode.
10. A high belite-calcium sulfoaluminate-calcium sulfosilicate cement prepared by mixing the clinker of claim 1 with gypsum in an amount corresponding to the amounts of calcium sulfoaluminate and SO in the clinker3The molar ratio was calculated as 2: 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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